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Keywords

macronutrients, corn yield

Abstract

Effects of nitrogen (N), phosphorus (P), and potassium (K) fertilization on a corn/ soybean cropping sequence were evaluated from 2015 to 2023 (corn planted in odd years) from a study initiated in 1983. Corn yields responded most to N, followed by P fertilization, and soybean yields were most influenced by P fertilization. The highest return on fertilizer investment averaged over both crops was when N, P, and K were more closely meeting the needs of the crops.

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